Information-theoretical meaning of quantum dynamical entropy

Details Information-theoretical meaning of quantum dynamical entropy Information-theoretical meaning of quantum dynamical entropy

2002-01-04

arxiv.org/abs/quant-ph/0201012v1

Physics

Quantum Physics

6 pages

Scientific paper

10.1103/PhysRevA.66.052302

The theory of noncommutative dynamical entropy and quantum symbolic dynamics for quantum dynamical systems is analised from the point of view of quantum information theory. Using a general quantum dynamical system as a communication channel one can define different classical capacities depending on the character of resources applied for encoding and decoding procedures and on the type of information sources. It is shown that for Bernoulli sources the entanglement-assisted classical capacity, which is the largest one, is bounded from above by the quantum dynamical entropy defined in terms of operational partitions of unity. Stronger results are proved for the particular class of quantum dynamical systems -- quantum Bernoulli shifts. Different classical capacities are exactly computed and the entanglement-assisted one is equal to the dynamical entropy in this case.

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